canon rumors FORUM

If you will shoot mainly at narrow apertures, get the 17 – 40. It's less expensive, similar in IQ at narrow apertures, and takes the same size filters as your 24 – 105. If you need to shoot handheld in low light, and thus wide open, the 16 – 35 is a better choice.

I bought the 16-35 over the 17-40 on the basis of having buyers remorse had I bought the 17-40 :-/

I'm not looking forward to the choice between the 24-105 and 24-70 f2.8 as I suspect I'll end up with both, but current plan is to buy what I really want when I can afford it, rather than work up with intermediate models. Currently working on prioritising over the next few years a 8-15 & 24-70 f2.8 to add to my 16-35 & 135, then hopefully add a 24/35 f1.4 and a 100-400 further down the line

I have the 17-40 and it's a very good lens overall... No regrets... Especially with the 5d3, you dont have to fret raising ISO if you need that speed... Granted, for how i shoot, for architecture, aviation, landscape, anywhere when I'd be needing the UW for my FF, I would use a tripod or monopod, I have rarely been in situations where I needed the 2.8. Dont sweat the small stuff unless you plan on handholding this lens/camera in dark warehouses day in and day out.

ChilledXpress

I have both but for the most part I use the wide angles for landscapes on a tripod, with narrow apertures... so usually at f/8 or higher. In this range or higher there is very little difference between the 16-35 or the 17-40. In these circumstances my filters are also easily swapped between my other lenses @77mm.

Still have both but 99% of the time the 17-40 is carried because it's less weight, filter friendly with the rest of the bag and pretty good in the IQ department. If I had to do again... I'd save the money and buy the 17-40. I use other faster glass for low light work if that's needed.

Unless you really need the zoom, can I suggest the 28 f/1.8 ? Great lens, versatile due to the extra stops, and you can always back up a few steps. To me, the more light the better. Don't worry about the lack of a red ring!If you're dead set on ultrawide, go 16-35. I've rented and loved it. Worth the added cost IMO.

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canon rumors FORUM

I went through the same decision last month and sold my 10-22. I liked it for the distortion but couldn't use it on my 5d mk3. 24mm on FF is wide enough for my uses. For the ULTRA wide look, I really like the 8-15 at 14mm or 15mm. if you need to "de-fish" it, it's pretty easy to do in Lightroom. Also, it's in between the price for the 17-40 and 16-35!

I love the 17-40 on 5d3, and strongly recommebd it. I've tried the 16-35, but the benefit was negligible for me.

I have been searchin for a 15mm 2.8 fish for over 6 months though, and have started to think about the 8-15 though. In the mean time cropping away at the Samyang 8mm T3.8 due to its massive vignette on ff.

ChilledXpress

I love the 17-40 on 5d3, and strongly recommebd it. I've tried the 16-35, but the benefit was negligible for me.

I have been searchin for a 15mm 2.8 fish for over 6 months though, and have started to think about the 8-15 though. In the mean time cropping away at the Samyang 8mm T3.8 due to its massive vignette on ff.

If you're on a FF...try Sigma's 15 mm Rectalinear Fisheye for FF (it also works on crops). At f/2.8 it sucks in light, is cheap, great close MFD and super sharp! I tested out both the 8-15 and this Sigma... hands down the Sigma won every time. I love it!!!

crasher8

I'm hunting for an UWA zoom after owning the 17-40 twice, once on a crop and it was the wrong choice and once on the 5D3 and had a bad copy. I am really interested in the Tokina 16-28 especially with Roger Cicata's review. I'm just bummed it has no filter threads as I love using a B+W circular Pol on my 24-105. No I'm not ready to invest in drop in filters. Check out the Tokina. Reviewers match it to the 16-35 on the wide end in the center and has sharper corners than both Canon's.

Went with the 17-40 because it is a bit smaller and lighter and is half the price. Did not feel the f2.8 was a big deal for me given the reasonable quality at high iso on the 5diii. I really liked my 10-22 on crop and that only opened to 3.5. Then, was lucky enough to find a good copy used and saved some more.